internal/manifest: add heap maintaining virtual backing rewrite candidates #5282
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To prepare the VirtualBackings struct to support maintaining a table backing heap, convert the backingWithMetadata map to store pointers.
…dates Add a rewriteCandidatesHeap which tracks the table backing with the lowest estimated amount of referenced data.
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manifest/internal: adjust VirtualBackings map to track pointers
To prepare the VirtualBackings struct to support maintaining a table backing
heap, convert the backingWithMetadata map to store pointers.
internal/manifest: create virtual_backings testdata dir
internal/manifest: add heap maintaining virtual backing rewrite candidates
Add a rewriteCandidatesHeap which tracks the table backing with the lowest
estimated amount of referenced data.